Motor-driven machine tool

Abstract

For a machine tool designed in particular as a saber saw, a configuration including a carrying frame is provided, via which the lifting rod and the support element are joined to form a unit that can be rotated about the longitudinal axis of the power tool, is mounted on the casing side, and guides a drive part of the lift drive on the lifting rod side.

The invention claimed is: 
     
       1. A motor-driven power tool, comprising:
 a housing; 
 a working tool defining a longitudinal axis and a working plane containing the longitudinal axis, the working tool being movable in rotary fashion about the longitudinal axis and being axially movable in a direction of the longitudinal axis; 
 a reciprocating drive including a lifting rod, the working tool being operatively connected to the lifting rod, and the reciprocating drive being configured to axially move the lifting rod and the working tool in the direction of the longitudinal axis; 
 a supporting element configured to act on the working tool in a direction of the working plane at a rear of the working tool; and 
 a supporting frame rotatably supported by the housing and configured to support the lifting rod and the supporting element, 
 wherein the supporting frame, the lifting rod and the supporting element are rotatable about the longitudinal axis of the working tool, and the supporting frame is configured to guide a drive part of the lifting rod, 
 wherein the lifting rod is configured to pivot relative to the supporting frame when the supporting element acts on the working tool, and 
 wherein the supporting frame is embodied in the form of a cage with an upper and lower support ring, which rings are connected to each other in stationary fashion by a longitudinal strut, with the upper support ring accommodating a pivot axle for the lifting rod and the lower support ring having support legs protruding in a direction toward the working tool on which the supporting element is supported. 
 
     
     
       2. The power tool according to  claim 1 , wherein the supporting element is able to pivot relative to the supporting frame about an axle extending transversely to the working plane and is movable in an orbital fashion via an adjusting drive. 
     
     
       3. The power tool according to  claim 1 , wherein the supporting element is driven so that it is able to rotate about the longitudinal axis of the working tool. 
     
     
       4. The power tool according to  claim 2 , wherein the supporting element is driven so that it is able to rotate about the longitudinal axis of the working tool. 
     
     
       5. The power tool according to  claim 3 , wherein a rotary drive that engages the supporting frame is provided in order to move the supporting frame in a rotary fashion. 
     
     
       6. The power tool according to  claim 4 , wherein a rotary drive that engages the supporting frame is provided in order to move the supporting frame in a rotary fashion. 
     
     
       7. The power tool according to  claim 3 , wherein:
 the lifting rod is rotatable about the longitudinal axis by a rotary drive structure, and 
 the supporting frame is connected to the lifting rod in a rotationally fixed manner. 
 
     
     
       8. The power tool according to  claim 4 , wherein:
 the lifting rod is rotatable about the longitudinal axis by a rotary drive structure, and 
 the supporting frame is connected to the lifting rod in a rotationally fixed manner. 
 
     
     
       9. The power tool according to  claim 7 , wherein:
 the lifting rod is configured to execute a reciprocating motion, 
 the lifting rod is rotationally fixed relative to the supporting frame, and 
 the pivot axle extends transversely to the working plane. 
 
     
     
       10. The power tool according to  claim 8 , wherein:
 the lifting rod is configured to execute a reciprocating motion, 
 the lifting rod is rotationally fixed relative to the supporting frame, and 
 the pivot axle extends transversely to the working plane. 
 
     
     
       11. The power tool according to  claim 1 , wherein the reciprocating drive includes a Scotch-yoke mechanism with the drive part embodied as a slotted crank element that is connected to the lifting rod in stationary fashion and extends transversely to the lifting rod. 
     
     
       12. The power tool according to  claim 11 , wherein the slotted crank element has a slot guide that extends transversely to the working plane and is engaged by an eccentric pin that is provided on a drive wheel of the crank mechanism embodied as an eccentric drive. 
     
     
       13. The power tool according to  claim 12 , wherein the eccentric pin is supported relative to the slot guide by a needle bearing, such that a part of the eccentric pin that engages with the slot guide is embodied as the needle bearing. 
     
     
       14. The power tool according to  claim 2 , wherein the supporting element includes a pivot lever having an adjusting sector configured to protrude in the opposite direction from the working tool and is situated in an overlap region with a drive element of the adjusting drive that is connected to the housing in stationary fashion. 
     
     
       15. The power tool according to  claim 14 , wherein the drive element of the adjusting drive constitutes an orbital drive and is embodied in the form of an adjusting element configured to act on the adjusting sector and is able to execute a reciprocating motion parallel to the longitudinal axis. 
     
     
       16. The power tool according to  claim 1 , wherein the supporting frame is rotatably supported on the housing by the upper support ring. 
     
     
       17. The power tool according to  claim 2 , wherein the power tool has a support plate, one side of which is provided with the adjusting drive and the other side of which is provided with the reciprocating drive of the working tool with its associated supporting frame. 
     
     
       18. The power tool according to  claim 1 , wherein the power tool is embodied in the form of a jigsaw with a saw blade as the working tool. 
     
     
       19. The power tool according to  claim 13 , wherein the power tool is embodied in the form of a jigsaw with a saw blade as the working tool.